* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

:root {
  --bg-main: linear-gradient(180deg, #EBF2FC 0%, #EEF8F9 100%);
  --card-bg: hsl(200, 60%, 99%);
  --card-outline: hsl(0, 0%, 78%);
  --header-text: hsl(226, 11%, 37%);
  --description-text: hsl(226, 11%, 37%);
  --button-bg: hsl(200, 60%, 99%);
  --button-text: hsl(226, 11%, 37%);
  --button-text-hover: hsl(200, 60%, 99%);
  --button-hover: hsl(0, 0%, 93%);
  --button-outline: hsl(0, 0%, 78%);
  --theme-button-bg: hsla(240, 3%, 94%, 0.7);
  --theme-button-hover: hsl(226, 11%, 37%);
  --toggle-inactive: hsl(0, 0%, 78%);
  --filter-btn-hover: hsl(3, 86%, 64%);
  --toggle-active: hsl(3, 71%, 56%);
  --toggle-focus: hsl(3, 71%, 56%);
  --remove-button-hover: hsl(3, 77%, 44%);
}

/* 🌙 Dark Theme */
[data-theme="dark"] {
  --bg-main: linear-gradient(180deg, #1E1E1E 0%, #2C2C2C 100%);
  --card-bg: hsl(226, 11%, 15%);
  --card-outline: hsl(0, 0%, 50%);
  --header-text: hsl(217, 61%, 90%);
  --description-text: hsl(217, 61%, 90%);
  --button-bg: hsl(226, 11%, 25%);
  --button-text: hsl(217, 61%, 90%);
  --button-text-hover: hsl(217, 61%, 90%);
  --button-hover: hsl(0, 0%, 40%);
  --button-outline: hsl(0, 0%, 78%);
  --theme-button-bg: hsla(240, 3%, 94%, 0.3);
  --theme-button-hover: hsl(226, 11%, 37%);
  --toggle-inactive: hsl(0, 0%, 60%);
  --filter-btn-hover: hsl(3, 86%, 64%);
  --toggle-active: hsl(3, 71%, 56%);
  --toggle-focus: hsl(3, 71%, 56%);
  --remove-button-hover: hsl(3, 77%, 44%);
}

body {
  background: var(--bg-main);
  min-height: 100vh;
  font-family: 'Noto Sans', sans-serif;
  font-size: 1rem;
}

img {
  max-width: 100%;
  display: block;
}

h1, h2, h3, button {
  line-height: 1.1;
}

button {
  cursor: pointer;
  background-color: var(--button-bg);
  color: var(--button-text);
  padding: 0.5rem 0.75rem;
  font-weight: 500;
  border-radius: 1.1rem;
  border: 0;
  outline: 1px solid var(--button-outline);
}

/* Filter Buttons */
.filter-btn {
  color: var(--button-text);
  font-size: 1.05rem;
}
.filter-btn:hover {
  background-color: var(--remove-button-hover);
  color: var(--button-text-hover);
}
.filter-btn:focus {
  outline: 2px solid var(--toggle-focus);
  outline-offset: 2px;
}
.filter-btn.active {
  background-color: var(--remove-button-hover);
  color: var(--button-text-hover);
}

/* Remove Button */
.remove-btn:hover,
.remove-btn:focus {
  background-color: var(--remove-button-hover);
  color: var(--button-text-hover);
  outline: 2px solid var(--toggle-focus);
  outline-offset: 2px;
}

.container {
  max-width: 90%;
  width: 1400px;
  margin: auto;
}

/* Header */
header {
  background-color: var(--card-bg);
  padding: 1rem;
  margin: 2rem 0 3rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: 1.25rem;
}

header .logo path:nth-child(2) {
  fill: var(--header-text);
}

.theme-btn {
  cursor: pointer;
  background-color: var(--theme-button-bg);
  color: var(--header-text);
  padding: 0.75rem;
  border-radius: 0.5rem;
}

.theme-btn:focus {
  outline: 2px solid var(--toggle-focus);
  outline-offset: 2px;
}

.grid-header {
  color: var(--header-text);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

@media (max-width: 768px) {
  .grid-header {
    flex-direction: column;
    gap: 2rem;
  }

  .filter-btns .filter-btn {
    padding: 0.75rem 1rem;
    font-size: 1.15rem;
    border-radius: 1.25rem;
  }
}

.filter-btns {
  display: flex;
  gap: 1rem;
}

/* Extensions Grid */
.extensions-grid {
  margin-bottom: 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

.item {
  background-color: var(--card-bg);
  padding: 1rem;
  border-radius: 1rem;
  outline: 1px solid var(--card-outline);
}

.item .top {
  color: var(--description-text);
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.item .name {
  color: var(--header-text);
  margin-bottom: 0.25rem;
  font-size: 1.25rem;
  font-weight: 700;
}

.item .bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

@media (max-width: 1024px) {
  .extensions-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .extensions-grid {
    grid-template-columns: 1fr;
  }
}

/* Toggle Switch */
.toggle-switch {
  width: fit-content;
  display: flex;
  position: relative;
}

.toggle-input {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
}

.toggle-input:focus-visible + .toggle-label {
  outline: 2px solid var(--toggle-focus);
  outline-offset: 2px;
}

.toggle-label {
  cursor: pointer;
  background-color: var(--toggle-inactive);
  width: 50px;
  height: 28px;
  display: block;
  border-radius: 2rem;
  transition: background-color 200ms;
  position: relative;
}

.toggle-label::before {
  content: '';
  background-color: #fff;
  width: 20px;
  height: 20px;
  position: absolute;
  top: 50%;
  left: 3px;
  transform: translateY(-50%);
  border-radius: 50%;
  transition: left 200ms ease;
}

.toggle-input:checked + .toggle-label {
  background-color: var(--toggle-active);
}

.toggle-input:checked + .toggle-label::before {
  left: 25px;
}